[bizzybody]

The ones I can identify.
2002 Video Girl AI, Mori Yuki from Space Battleship Yamato, Harry Potter, Faye Valentine from Cowboy Bebop
2003 I got nuthin, but I'd like to see the anime that has the characters 3rd and 4th from the right. ;)
2004 Nada
2005 Another null
2006 I know nothing
2007 Goose egg, but what character/show is Ho-Chan cosplaying?
2008 I'm so confused!
2009 Never seen a one of those except the Vocaloid
2010 Drawing a blank again
2011 Rei from Evangelion

[Arrnea]

There's a Madoka in the 2011 as well, if I'm not much mistaken. Second from the left.

[Alex Warlorn]

I always figured Ellen would be the one to dress up as Madoka, she's the one with the curse of the magical girl, and seems like she might be able to pull a Madokami in the current arch.

Nothing like having eternity compacted into a moment to have time to take a level on badass. http://tvtropes.org/...kALevelInBadass